batch-autoscale-formula.txt

// In this example, the pool size is adjusted based on the number of tasks in the queue.
// Note that both comments and line breaks are acceptable in formula strings.

// Get pending tasks for the past 15 minutes.
$samples = $ActiveTasks.GetSamplePercent(TimeInterval_Minute * 15);

// If we have fewer than 70 percent data points, we use the last sample point,
// otherwise we use the maximum of last sample point and the history average.
$tasks = $samples < 70 ? max(0, $ActiveTasks.GetSample(1)) :
max( $ActiveTasks.GetSample(1), avg($ActiveTasks.GetSample(TimeInterval_Minute * 15)));

// If number of pending tasks is not 0, set targetVM to pending tasks, otherwise half of current dedicated.
$targetVMs = $tasks > 0 ? $tasks : max(0, $TargetDedicatedNodes / 2);

// The pool size is capped at 120, if target VM value is more than that, set it to 120.
cappedPoolSize = 120;
$TargetDedicatedNodes = max(0, min($targetVMs, cappedPoolSize));

// Set node deallocation mode - keep nodes active only until tasks finish
$NodeDeallocationOption = taskcompletion;